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Theorem sltssn 28138
Description: Surreal set less-than of two singletons. (Contributed by Scott Fenton, 17-Mar-2025.)
Hypotheses
Ref Expression
sltssn.1 (𝜑 → 𝐴 ∈ No )
sltssn.2 (𝜑 → 𝐵 ∈ No )
sltssn.3 (𝜑 → 𝐴 <s 𝐵)
Assertion
Ref Expression
sltssn (𝜑 → {𝐴} <<s {𝐵})

Proof of Theorem sltssn
StepHypRef Expression
1 sltssn.3 . 2 (𝜑 → 𝐴 <s 𝐵)
2 sltssn.1 . . 3 (𝜑 → 𝐴 ∈ No )
3 sltssn.2 . . 3 (𝜑 → 𝐵 ∈ No )
42, 3sltssnb 28137 . 2 (𝜑 → ({𝐴} <<s {𝐵} ↔ 𝐴 <s 𝐵))
51, 4mpbird 260 1 (𝜑 → {𝐴} <<s {𝐵})
Colors of variables:    wff setvar class
This proof depends on syntax axioms:   → wi 4   ∈ wcel 2145  {csn 4584   class class class wbr 5103   No csur 27979   <s clts 27980   <<s cslts 28125
This proof depends on axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1828  ax-4 1842  ax-5 1943  ax-6 2000  ax-7 2041  ax-8 2147  ax-9 2155  ax-ext 2733  ax-sep 5249  ax-pr 5391
This proof depends on definitions:  df-bi 210  df-an 402  df-or 862  df-3an 1105  df-tru 1573  df-fal 1583  df-ex 1813  df-sb 2100  df-clab 2740  df-cleq 2753  df-clel 2836  df-ral 3078  df-rex 3088  df-rab 3414  df-v 3453  df-dif 3902  df-un 3904  df-in 3906  df-ss 3916  df-nul 4280  df-if 4483  df-sn 4585  df-pr 4587  df-op 4591  df-br 5104  df-opab 5168  df-xp 5657  df-slts 28126
This theorem is used by:  cutneg  28184  zcuts  28775  twocut  28791  nohalf  28792  pw2recs  28806  halfcut  28826  addhalfcut  28827  pw2cut2  28830  bdaypw2n0bndlem  28831  bdayfinbndlem1  28835
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